As announced in the September project post, it seems impossible to make custom food for toddlers in Sims 3. Unlike other foods, the game considers them like social interactions, not like "real food".
So, I've made the toddler meal tray as deco only. You still get a baby-steamer working like an Arsil's food generator.
And as I was too disappointed for our Sims 3 youngest, I converted an EA Sims 4 outfit for them, with tiny warm boots and a cap. I might have anticipated winter a bit early... next time, I'll make swimming-suits! ;)
Including: